I would recommend a complete physical examination to determine if blood work is normal, hormones such as thyroid are at the proper levels and to see if there are any other physical signs. The doctor could also do a basic evaluation for depression, which often has a symptom of excess sleepiness. If this is the case and other physical problems are ruled out, you might benefit from medication and/or therapy. Your family doctor might be comfortable treating this or may refer you to a psychiatrist for further evaluation.

At any rate, it is important for you to seek help as this would not be considered normal sleep patterns. You are clearly already aware of this - I don't mean to be redundant! If you have any thoughts about hurting yourself or others, please get immediate help.